Integrated: 8270839: Remove deprecated implementation methods from Scene

[Kevin Rushforth]

On Fri, 16 Jul 2021 17:53:21 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This removes following implementation methods in Scene by making them package-scope. They were previously deprecated for removal by [JDK-8270246](https://bugs.openjdk.java.net/browse/JDK-8270246):
> 
> 
>     public void disposePeer()
>     public void enableInputMethodEvents(boolean enable)
>     public void processKeyEvent(KeyEvent e) 
> 
> 
> One of the test harness classes was calling `Scene::processKeyEvent` directly, so I changed it to call it via `SceneHelper`.

This pull request has now been integrated.

Changeset: 97d70afb
Author:    Kevin Rushforth <kcr at openjdk.org>
URL:       https://git.openjdk.java.net/jfx/commit/97d70afb74c5a2599326796ccc9ce799d76e0b96
Stats:     26 lines in 3 files changed: 3 ins; 17 del; 6 mod

8270839: Remove deprecated implementation methods from Scene

Reviewed-by: arapte, aghaisas

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PR: https://git.openjdk.java.net/jfx/pull/579